export function openLogin(){
    const app = document.getElementById('app');
    const container = document.querySelector('#container');
    const el = container.querySelector('email-login');
    //clone fragment中对象
    const elCopy = document.importNode(el,true);
    elCopy.setAttribute('id', 'email-login');
    //放入到app
    app.appendChild(elCopy);
    elCopy.open();
}